<div>
  <div v-bind:class="myStyle.red()">
    For the night is dark and full of terrors.
  </div>
  <div v-bind:class="array(myStyle.red(), myStyle.bold())">
    For the night is dark, full of terrors and bold.
  </div>
  <div v-bind:class='isRed ? myStyle.red() : ""'>
    For the night is dark, full of terrors and might or not be red.
  </div>
  <div v-bind:class='array(isRed ? myStyle.red() : "", myStyle.bold())'>
    For the night is dark, full of terrors, might or not be red and always BOLD.
  </div>
</div>